I rinsed the same sand with tap water and it turned out just fine i also have a few sps in the tank and other corals and nothing seems to be wrong with them. IMO I think using RO/DI is just a waste of time because you have to wait for it to be filtered blah blah blah is just use tap water to rinse. It all up to you though.
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10g softie and LPS tank(SPS soon  ) coralife 28w 50/50 rio nano skimmer
Live stock
-1 Pulsing xinia
- Green candy cane
- green zoas
- GSP
- Fake percula clown
- Diadem dottyback
 adding a 70w MH with 8 LED
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